Apparatus for manufacturing drafting rolls



Sept. 17, 1929.

F. o. HOAGLAND 1,728,286

APPARATUS FOR MANUFACTURING DRAFTING ROLLS I 2 Sheets-Shet. l

' Filed Dec. 26, 1924 6 g '6 INVENTOR.-- E "4% 4 v i ATioRNEy-x PatentedSept. 17, 1929 UNITED srAres PATENT [OFFIC I FRANK O. HOAGLAND, OFBRIDGEPORT, CONNECTICUT, ASSIGNOR T SACO-IJOXVELL SHOPS, 015 BOSTON,MASSACHUSETTS, A CORPORATION OF 'MASSAOI-IUSETTS APPARATUS FORMANUFACTURING DRAFTING ROLLS Application filed December 26, 1924. SerialNo. 758,167.

This invention relates to the manufacture of grooved metal parts such asthe drafting rolls used extensively in textile machinery. For example,in a spinning frame the roving passes between two or more pairs ofdrawing rolls on its way to the spindle, and these rolls usually aregrooved longitudinally to enable them better to grip the roving.Heretofore the grooves in rolls of this character have usually been madeby planing. The present invention aims to improve the apparatus used forthis purpose with a view especially to reducing the expense ofmanufacture of such rolls.

The nature of the invention will be readily understood from thefollowing description when read in connection with the accompanyingdrawings and the novel features will be particularly pointed out in theappended claims.

Referring now to the drawings,

Figure 1 is an end view showing somewhat diagrammatically an apparatusconstructed in accordance with this invention;

Fig. 2 is a side view, partly in cross section, of the apparatusshown inFig. 1;

Fi 3 is a fragmentary plan view on the 23 line 83, Fig. 2;

Fig. 4 is a vertical cross sectional view of the grooving tools shown inFigs. 1 and 2 and the parts immediately associated therewith: and

Figs. 5 and 6 are fragmentary cross sectional views illustrating themanner in which 3.3 the grooving operation is performed.

In Fig. 1, 2 indicates a fixture secured on the reciprocating table of aplaning machine. This fixture carries a series of chucks each adapted tosupport a drafting roll blank B.

5) The chucks are preferably arranged in pairs, as shown, each chuckcomprising a stationary member 4 having a face adapted to bear againstone side of the roll, and a member 5 which is movable toward and fromthe sta- 4-5 tionary member 4. The part 5 is made in the form of a jawand these two jaw members of adjacent chucks are arranged back to back.A wedge 6 located between the jaws 55 is operable to force them apartand thus clamp the work against their respective stationary member 4- aswill be evident from an inspection of Fig. 1. In the construction shownthe wedge 6 is pivoted to the upper end of a lever 7, and a strongcoiled spring 8 connected with this levertends to pull it forward, thatis, in the direction necessary to force the wedge inwardly between thetwo jaws 5--5.

The machine is also equipped with the usual indexing mechanism forrotating the blanks B step'by step, as required during the groovingoperation, but since this mechanism is a well known'part of the machineit is not illustrated. I j

The grooving operation is performed by two grooving disks 10 and 12,respectively, these disks being supported in a slotted holder 14 whichis clamped in a horizontal bar 15 that extends across the table 2 andabove it, the bar being supported in a stationary posi tion. The disksshown in Figs. 4, 5 and 6 are designed especially forgrooving thedrawing rolls used in a spinningframe. In the construction illustratedthe disk 10 is mounted on a shaft 16 which is rotatably supported inbushings 17l7 fastened in the opposite arms of the holder 14. A key 18consisting of a round pin secures the disk 10 and shaft 16 together forrotation in unison. This disk 10 is'provided with a hub portion 19 thatis of substantially the same width asthe'slot in the holder, having justenough clearance to run freely. While this arrangement therefore permitsthe diskylO to rotate freely, it holds the disk in a fixed position, anyaxial move,

ment of the disk with reference to the holder being prevented.

The other disk 12 is mounted to rotate freely on the hub 19 but is givena slightlateral' clearance of, say, two or threet-housandths of an inchso that it can have a very limited axial movement relatively to the disk10. Normally the disk 12 is held against the disk 10 by a spring 30acting through a plunger 31 and backed up by a screw 32, these parts allbeing mounted in an aperture formed in one arm of the holder 14.

In performing this groovingoperation a drawing roll blank is firstturned in the usual manner, the reduced necks Z) being formed at thedesired intervals. The blank is then set in one of the chucks on thetable 2 and the holder 14 is adjusted in the bar so that the lower edgesof the grooving disks 10 and 12 will project below the peripheralsurface of the blank B. The table 2 is next moved forward into contactwith the disks and under them, thus rolling the disks along theperiphery of the blank B for its entire length. Since both the tools andthe work are supported rigidly, this Operation results in rolling twogrooves in the blank, as indicated in Fig. 5. It will be observed thateach disk has a relatively thin flat edge with bevelled margins whichdiverge as they extend backwardlyfrom said edge, this flat portion ofthe edge being really approximately cylindrical in form. As each diskrolls along the surface of the work it forms a groove partly bydepressing the metal under the edge of the disk and partly by raisingthe metal at opposite sides of said edge. This is illustrated in Fig. 5,the metal being lifted quite appreciably at .20." The blank B is nextindexed by a distance equal to that between centers of the grooves. thisindexing operation taking place while the disks are out of contact withthe blank, and the disks are again traversed over the blank. This causesthe disk 10 to make a new groove, while the disk 12 travels in thegroove previously made by the disk 10. In certain kinds of these drawingrolls the grooves are not spaced with absolute uniformity but arepurposely spaced by intervals which are slightly irregular ornon-uniform. This spacing is controlled by the indexing mechanism andthe formation of the grooves at the proper intervals is ensured by thefact that the disk 10 is compelled to rotate in a fixed position, noaxial movement of this disk relatively to its holder being permitted.The slight axial movement permitted to the disk 12, however, enablesthis disk to adjust itself. to the irregularities in spacing betweenadjacent grooves. The disk 10, therefore, may be termed a master,while'the. disk 12 is a follower.

Inasmuch as the plane of the meeting faces of the disks is approximatelyradial to the blank B, I prefer to make the flat edges of the two diskssomewhat inclined, as indicated in Fig. 5. Preferably this inclinationis such that the loweredges of the disks when in their working positionhe in planes approximately tangent to a circle drawn through the beds ofthe grooves. I These tangent planes being indicated by therlin'es'22 and23, Fig. 5.

It should also be noted that the inclination of one marginal face ofeach disk is greater than that of the other with reference to a planeperpendicular to the axis of the disk.

The margins of the disks shown are in clined at an angle of withreference to each other, and the inner marginal face 24 of the masterdisk 10 lies at an angle of 19 with reference to the median plane 25 ofthe disk, while the outer margin 26 lies at an angle of 26 withreference to said plane 25. The marginal faces 27 and 28 of the followerdisk 12 make angles of 19 and 26 approxi mately with reference to themedian plane of this disk. The inclination of these marginal faces ismade such that when the blank B has been indexed one tooth the followerdisk 12 will occupy substantially the same relative relationship to thegroove that the master disk 10 previously occupied.

The operations above described are continued until the groovingoperation is completed. That is, the blank is reciprocated backwardandforward under the grooving disks 10 and 12-, running out of contactwith the disks at each end of its stroke and being indexed into a newposition between successive reciprocating movements. After grooves havebeen formed around the entire blank B, the disks are traversed throughthe entire series of grooves again and sometimes this re-traversing isperformed several more times so that the blank is caused to make asufficient num ber of complete revolutions while the disks operate on itin order to properly shape each tooth between the two disks. In theinitial formation of the teeth by the grooving operation, there is atendency for the teeth to lean somewhat. The follower cooperates withthe master to correct this tendency and to effect a re-shaping of thewalls of the grooves to bring each tooth into a radial position. The twodisks also cooperate to force the metal upwardly between them andtherefore act to increase the height of the teeth. By indexing the blankthrough two, three, or more revolutions, as may be desired, the diskscorrect any malformation of the grooves or teeth which has been producedin the initial grooving operation.

The distance between centers of the edges of the two disks preferably ismade equivalent to the minimum distance between grooves, and since boththe master and the follower form grooves on their first stroke acrossthe work, this groovingoperation is started at the point on the rollwhere grooves of minimum spacing are to be made. This applies, ofcourse, only to those rolls in which the grooves are not spaceduniformly.

Vhen the grooving operation has been completedtheblank is removed and itis then ground in order to reduce it to the desired diameter. The rollnext is subjected to a lengthwise lapping operation which removes burrscaused by grinding and gives the desired finish. These grinding andlapping operations maybe performed in the usual manner.

t will be evident to those skilled in this art that this inventioneffects substantial economies in the manufacture of grooved rolls. Notonly can the grooves be made more economically in the manner abovedescribed than by the usual planing operation, but the grain structureof the walls of the grooves is much more satisfactory, the grain of thesteel running radially of the flutes instead of cross wise, as when thegrooves are cut by planing or the like. It also materially facilitatesthe finishing operations since it eliminates the filing which has beennecessary heretofore and reduces the length of time required to porformthe lapping operation.

lVhile I have herein shown and described the best embodiment of myinvention that I have so far devised, it will be understood that theinvention is not limited to embodiment in the precise form shown. Forexample, the

grooving disks used necessarily will be de signed in accordance with thework which they are intended to perform. The apparatus may be modifiedin other particulars without departing from the spirit or scope of theinvention.

It is also contemplated that more than two grooving disks may be used,if desired. For example, three disks could be employed, one to effect arough grooving and the other two disks being arranged and cooperating asabove described. Such an arrangement could be used to advantage inmaking rolls having grooves spaced by regular intervals, since the firstdisk would take much of the wear which in the arrangement illustratedmust be taken by the master disk 10.

Having thus described my invention, what I desire to claim as new is:

1. In a machine for grooving drafting rolls and the like, thecombination of two grooving disks, a holder in which said disks aremounted side by side for rotation, a support for said holder, saidholder supporting one of said disks for rotation in a fixed position,and the other disk having a limited freedom of movement toward and fromits companion disk, and means for supporting a drafting roll blank inposition for the operation thereon of said disks simultaneously and formovement relatively to said disks to transfer their point of operationlongitudinally of the blank.

2. In a machine for grooving drafting rolls and the like, thecombination of two grooving disks, a holder in which said disks aremounted side by side for rotation and for simultaneous operation on thework, a support for said holder, said holder supporting one of saiddisks for rotation in a fixed position,

and the other disk having a limited freedom of movement toward and fromits companion disk, a table mounted for reciprocating movementrelatively to said holder, and a chuck on said table for holding adrafting roll blank in position for the operation thereon of said disksand for rotary indexing movement relatively to said disks.

3. A grooving tool comprising two grooving disks, and a holder in whichsaid disks are mounted side by side for rotation, each of said diskshaving a relatively thin edge with the opposite marginal faces of thedisk diverging as they extend backwardly away from said edge, saidholder supporting one of said disks for rotation in a fixed relationshipto said holder while permitting the other disk to have a limited,freedom of movement axially with reference to the first disk.

4:. A grooving tool comprising two grooving disks, a holder having aslot in which said disks are mounted side by side for rotation, one ofsaid disks having a hub fitting snugly in the slot in said holder, and ashaft support ing the latter disk for rotation, the second disk runningon the hub of the first disk.

5. A grooving tool comprising two grooving disks, a holder in which saiddisks are mounted side by side for rotation and for simultaneousoperation on the work, said disks having thin approximately cylindricaledges with tapered margins extending backwardly from said edges, andsaid edges being inclined slightly with reference to each other.

6. A grooving tool comprising two grooving disks, a holder in which saiddisks are mounted side by side for rotation and for simultaneousoperation on the Work, each of said disks having a thin approximatelycylindrical edge with the opposite marginal faces of the disk divergingas they extend backwardly away from said edge, one of said faces beinginclined at a greater angle than the other with reference to a planenormal to the axis of said disk.

7 A grooving tool comprising a holder, a grooving disk supported in saidholder for rotation but held otherwise in a fixed relationship to theholder, a second disk rotatably mounted in said holder beside the firstdisk and having a limited freedom of movement axially with reference tothe first disk, and means for yieldingly holding the second disk in afixed axial relationship to the first disk.

8. A grooving tool comprising two grooving disks, a holder having a slotin which said disks are mounted side by side for rotation and forsimultaneous operation on the work, one of said disks having a hubfitting snugly in the slot in said holder, a shaft supporting the latterdisk for rotation, the second disk running on the hub of the first disk,and a spring pressed plunger bearing on said sec ond disk and yieldinglyholding it in a fixed axial relationship to the first disk.

FRANK O. HOAGLAND.

